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b.1&3 , 2&3
y = mx + c
y = 1/2 x - 5
m1 = 1/2
garis 2
2y - x + 6 = 0
a = -1
b = 2
m2 =
m2 =
garis 3
6x + 3y = 18
6x + 3y - 18 = 0
a = 6
b = 3
m3 =
m3 =
m3 = -2
garis sejajar :
garis 1 dan garis 2, karena :
m1 = m2
1/2 = 1/2
garis tegak lurus :
garis 1 dan garis 3, karena :
m1.m3 = -1
1/2.-2 = -1
-1 = -1
garis 2 dan garis 3, karena :
m2.m3 = -1
1/2.-2 = -1
-1 = -1